A three-day-old white lion cub sleeps next to other lions in Belgrade Zoo, Serbia, Wednesday, April 20, 2011. The four white lions cubs, an extremely rare subspecies of the African lion were recently born in Belgrade Zoo.

A three-day-old white lion cub sleeps in Belgrade Zoo, Serbia, Wednesday, April 20, 2011. The four white lions cubs, an extremely rare subspecies of the African lion were recently born in Belgrade Zoo.

A three-day-old white lion cub sleeps next to other lions in Belgrade Zoo, Serbia, Wednesday, April 20, 2011. The four white lions cubs, an extremely rare subspecies of the African lion were recently born in Belgrade Zoo.